He adds: "in theory, you could have a plug-in hybrid with a renewable fuel powered [internal combustion engine] and eliminate the need for petroleum all together."
他还称：“理论上讲，你可以在使用可再生燃料的引擎上增加一个混合插件，这样可以彻底不使用汽油。”
The quality specification for sulphur contents in petroleum products is an important item related to engine corrosion and environmental emission.
石油产品的硫含量质量指标，是与发动机的腐蚀及环保排放有关的重要项目。
They directed their own auto industry to drop hybrid engine research because they realize petroleum will be exhausted in 20 years and to find alternatives.
他们集中自己的汽车工业上努力，他们实现混合引擎研究，因为他们知道石油将在20年内枯竭，找到替代能源。
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